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Ontario Power Outages

Canada has no open live feed, so the quickest way to check Ontario is the official outage map from Hydro One, Alectra and Toronto Hydro or another operator below.

Hydro One serves nearly 1.5 million mostly rural customers, while more than 50 local distribution companies, led by Alectra, Toronto Hydro and Hydro Ottawa, serve cities and towns. Nuclear produced 51% of 2023 generation and hydro 25%. The May 2022 derecho interrupted 1.85 million customers across 15 distributors, and the March 2025 ice storm interrupted 1.13 million Hydro One customers, 76% of its base. The IESO runs the grid and the Ontario Energy Board regulates distributors.

Population
16,262,121
Estimate, 2026
Utilities
15
Weather warnings
2
Environment and Climate Change Canada
Major past events
6
Northeast blackout of 2003

Who to contact in Ontario

The utilities responsible for faults in Ontario. Search your address on an official outage map to confirm which one is yours.

Canada utilities, outage map links and phone numbers
UtilityOfficial outage mapReport by phone
Hydro OneOpen ↗1-800-434-1235; text WATTS (92887)
AlectraOpen ↗1-833-253-2872
Toronto HydroOpen ↗416-542-8000, press 1
Hydro OttawaOpen ↗613-738-0188
ElexiconOpen ↗1-866-579-6819
London HydroOpen ↗519-661-5555
EnovaOpen ↗226-896-2200
GrandBridgeOpen ↗1-833-769-3701; text 1-888-726-1139
ENWINOpen ↗519-255-2727
Oakville HydroOpen ↗905-825-9400; text 289-813-2785
Burlington HydroOpen ↗1-877-310-4937
EntegrusOpen ↗1-866-804-7325
Oshawa PowerOpen ↗905-723-4623
Niagara Peninsula EnergyOpen ↗1-877-270-3938
Synergy NorthOpen ↗807-343-1111 or 1-833-428-1451, option 2

If you see a fallen power line, stay 10 metres away and call 911.

Ontario on the Canada map

OntarioQuebecBritish ColumbiaAlbertaManitobaSaskatchewanNova ScotiaNew BrunswickNewfoundland and LabradorPrince Edward IslandNorthwest TerritoriesYukonNunavutOntarioQuebecBritish ColumbiaAlbertaManitobaSaskatchewanNewfoundland and LabradorNorthwest TerritoriesYukonNunavut
Canada has 13 provinces and territories, shown over a 800 by 697 map.

Boundaries: Natural Earth (public domain).

Weather warnings

  • Special weather statementstatement

    Searchmont - Montreal River Harbour - Batchawana Bay, Atikokan - Shebandowan - Quetico Park, City of Thunder Bay, Cloud Bay - Dorion and 5 more zones

    Until Nov 5, 6:00 p.m. EST

  • Rainfall warningwarning

    Agawa - Lake Superior Park, Wawa - Pukaskwa Park, White River - Dubreuilville

    Until Nov 4, 11:00 p.m. EST

Source: Environment and Climate Change Canada (Meteorological Service of Canada)

Largest places in Ontario

  • Toronto
  • Ottawa
  • Mississauga
  • Brampton
  • Hamilton
  • London

Nearby provinces and territories

Reliability in Ontario

Average minutes without power and interruptions per customer, as published by the regulator or operator

UtilityTime without powerInterruptionsYear
Hydro One45 hr 25 min4.562025
Alectra1 hr 52 min1.672025
Toronto Hydro1 hr 12 min1.342025
Hydro Ottawa1 hr 50 min1.392025
Elexicon3 hr 3 min2.142025
London Hydro2 hr 55 min2.782025
Enova1 hr 28 min1.512025
GrandBridge1 hr 30 min1.952025
ENWIN1 hr 2 min2.242025
Oakville Hydro21 min0.632025
Burlington Hydro2 hr 35 min2.162025
Entegrus2 hr 18 min2.212025
Oshawa Power35 min0.622025
Niagara Peninsula Energy2 hr 16 min1.772025
Synergy North1 hr 16 min2.222025

Definitions vary by source, for example in how major storms are treated, so these figures aren't a ranking. See each operator's page for the exact scope.

Major power outages affecting Ontario

Totals may cover every area affected, not only this one. Full accounts are on the Canada page.

  1. Northeast blackout of 2003

    August 14, 2003

    10,000,000 people affected

    states and Ontario, including 10 million Ontarians, and interrupted about 61,800 MW of load. Ontario's system was restored within 30 hours, but a provincial state of emergency stayed in effect until August 22 while generation returned to full output.

    Source: U.S.-Canada Power System Outage Task Force, Final Report

  2. May 2022 derecho

    May 21, 2022

    2,406,654 customers affected

    Fifteen Ontario distributors reported 1,852,005 customers interrupted, including 890,100 at Hydro One (60% of its base), 297,650 at Alectra and 180,946 at Hydro Ottawa (54%). Hydro One took about 250 hours to restore 90% of those affected, and Hydro Ottawa called the damage to its system worse than in the 1998 ice storm.

    Source: Ontario Energy Board open data, RRR 2.1.4.2.10 Major Event Response Reporting

  3. Great Ice Storm of 1998

    January 5, 1998

    1,623,000 customers affected

    Hydro-Québec's outages peaked at 1,393,000 customers on January 10, and Statistics Canada counted over 230,000 more in Ontario.

    Source: Hydro-Québec, The January Ice Storm

  4. March 2025 Ontario ice storm

    March 28, 2025

    1,294,890 customers affected

    Eight Ontario distributors reported 1,294,890 in total, with hard-hit InnPower and Wasaga Distribution at 89% and 100% of their customers.

    Source: Ontario Energy Board open data, RRR 2.1.4.2.10 Major Event Response Reporting

  5. April 2023 Québec ice storm

    April 5, 2023

    1,125,000 customers affected

    On the same date in Ontario, Hydro One reported 359,000 customers interrupted and Hydro Ottawa 163,448.

    Source: Hydro-Québec via Newswire, Ice storm: update on the outages, April 8, 2023

  6. December 2013 Toronto ice storm

    December 21, 2013

    416,000 customers affected

    About 416,000 Toronto Hydro customers, 57% of its base, lost power at some point, affecting more than one million city residents.

    Source: Toronto Hydro Independent Review Panel Report, June 2014 (City of Toronto)

Ontario power outage news

Ontario power outage FAQ

Who do I contact about a power outage in Ontario?

Hydro One (1-800-434-1235; text WATTS (92887)), Alectra (1-833-253-2872), Toronto Hydro (416-542-8000, press 1) and Hydro Ottawa (613-738-0188) repair the local network in Ontario, which includes Toronto, Ottawa and Mississauga.

What was the biggest power outage in Ontario?

Northeast blackout of 2003 (August 14, 2003) affected about 10,000,000 people. states and Ontario, including 10 million Ontarians, and interrupted about 61,800 MW of load. Ontario's system was restored within 30 hours, but a provincial state of emergency stayed in effect until August 22 while generation returned to full output.

How reliable is the power supply in Ontario?

Hydro One reported 45 hr 25 min of interruption per customer in 2025, and Alectra reported 1 hr 52 min of interruption per customer in 2025, and Toronto Hydro reported 1 hr 12 min of interruption per customer in 2025. Scope differs between sources, so treat these as a guide and not a ranking.

Cite this page

You may reuse our derived data under CC BY 4.0 with attribution. Weather alerts contain information licensed under the Data Server End-use Licence of Environment and Climate Change Canada.

PowerOutageTracker.com. "Ontario Power Outages." Accessed November 3, 2026. https://poweroutagetracker.com/world/canada/ontario
Sources (5)